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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08517c2b38a7e0d1a4631615dc52b91d8a9f9632f38ea7196238091f8de31e58' 
  AND token = 'DymO6JL0SNFDP9p/mVqiQ41TErpU2dOGYo5lV2Ko8rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}